[Doug]

I found this on our sister forum:

Foam Rocks

He also has great info on mould making and aluminium benchwork.

 

[Makemineadouble]

I've got to say I found this to be a very intresting site, thanks for the URL.

 

[Gwent rail]

Got to try this one out!
I would seem to be a good alternative to using the expanded polystyrene we all love to hate and probably more realistic too.
Thanks Doug, definitely worth a go.